<template>
	<view class="uni-swiper__warp">
		<slot />
		<view v-if="mode === 'default'" :style="{ bottom: dots.bottom + 'px' }" class="uni-swiper__dots-box" key="default">
			<view
				v-for="(item, index) in info"
				@click="clickItem(index)"
				:style="{
					width: (index === current ? dots.width * 2 : dots.width) + 'px',
					height: dots.width / 2 + 'px',
					'background-color': index !== current ? dots.backgroundColor : dots.selectedBackgroundColor,
					'border-radius': '0px',
				}"
				:key="index"
				class="uni-swiper__dots-item uni-swiper__dots-bar"
			/>
		</view>
		<view v-if="mode === 'dot'" :style="{ bottom: dots.bottom + 'px' }" class="uni-swiper__dots-box" key="dot">
			<view
				v-for="(item, index) in info"
				@click="clickItem(index)"
				:style="{
					width: dots.width + 'px',
					height: dots.height + 'px',
					'background-color': index !== current ? dots.backgroundColor : dots.selectedBackgroundColor,
					border: index !== current ? dots.border : dots.selectedBorder,
				}"
				:key="index"
				class="uni-swiper__dots-item"
			/>
		</view>
		<view v-if="mode === 'round'" :style="{ bottom: dots.bottom + 'px' }" class="uni-swiper__dots-box" key="round">
			<view
				v-for="(item, index) in info"
				@click="clickItem(index)"
				:class="[index === current && 'uni-swiper__dots-long']"
				:style="{
					width: (index === current ? dots.width * 3 : dots.width) + 'px',
					height: dots.height + 'px',
					'background-color': index !== current ? dots.backgroundColor : dots.selectedBackgroundColor,
					border: index !== current ? dots.border : dots.selectedBorder,
				}"
				:key="index"
				class="uni-swiper__dots-item"
			/>
		</view>
		<view
			v-if="mode === 'nav'"
			key="nav"
			:style="{ 'background-color': dotsStyles.backgroundColor, bottom: '0' }"
			class="uni-swiper__dots-box uni-swiper__dots-nav"
		>
			<text :style="{ color: dotsStyles.color }" class="uni-swiper__dots-nav-item">{{
				current + 1 + '/' + info.length + ' ' + info[current][field]
			}}</text>
		</view>
		<view v-if="mode === 'indexes'" key="indexes" :style="{ bottom: dots.bottom + 'px' }" class="uni-swiper__dots-box">
			<view
				v-for="(item, index) in info"
				@click="clickItem(index)"
				:style="{
					width: dots.width + 'px',
					height: dots.height + 'px',
					color: index === current ? dots.selectedColor : dots.color,
					'background-color': index !== current ? dots.backgroundColor : dots.selectedBackgroundColor,
					border: index !== current ? dots.border : dots.selectedBorder,
				}"
				:key="index"
				class="uni-swiper__dots-item uni-swiper__dots-indexes"
				><text class="uni-swiper__dots-indexes-text">{{ index + 1 }}</text></view
			>
		</view>
	</view>
</template>

<script>
/**
 * SwiperDod 轮播图指示点
 * @description 自定义轮播图指示点
 * @tutorial https://ext.dcloud.net.cn/plugin?id=284
 * @property {Number} current 当前指示点索引，必须是通过 `swiper` 的 `change` 事件获取到的 `e.detail.current`
 * @property {String} mode = [default|round|nav|indexes] 指示点的类型
 * 	@value defualt 默认指示点
 * 	@value round 圆形指示点
 * 	@value nav 条形指示点
 * 	@value indexes 索引指示点
 * @property {String} field mode 为 nav 时，显示的内容字段（mode = nav 时必填）
 * @property {String} info 轮播图的数据，通过数组长度决定指示点个数
 * @property {Object} dotsStyles 指示点样式
 * @event {Function} clickItem 组件触发点击事件时触发，e={currentIndex}
 */

export default {
	name: 'UniSwiperDot',
	emits: ['clickItem'],
	props: {
		info: {
			type: Array,
			default() {
				return [];
			},
		},
		current: {
			type: Number,
			default: 0,
		},
		dotsStyles: {
			type: Object,
			default() {
				return {};
			},
		},
		// 类型 ：default(默认) indexes long nav
		mode: {
			type: String,
			default: 'default',
		},
		// 只在 nav 模式下生效，变量名称
		field: {
			type: String,
			default: '',
		},
	},
	data() {
		return {
			dots: {
				width: 6,
				height: 6,
				bottom: 10,
				color: '#fff',
				backgroundColor: 'rgba(0, 0, 0, .3)',
				border: '1px rgba(0, 0, 0, .3) solid',
				selectedBackgroundColor: '#333',
				selectedBorder: '1px rgba(0, 0, 0, .9) solid',
			},
		};
	},
	watch: {
		dotsStyles(newVal) {
			this.dots = Object.assign(this.dots, this.dotsStyles);
		},
		mode(newVal) {
			if (newVal === 'indexes') {
				this.dots.width = 14;
				this.dots.height = 14;
			} else {
				this.dots.width = 6;
				this.dots.height = 6;
			}
		},
	},
	created() {
		if (this.mode === 'indexes') {
			this.dots.width = 12;
			this.dots.height = 12;
		}
		this.dots = Object.assign(this.dots, this.dotsStyles);
	},
	methods: {
		clickItem(index) {
			this.$emit('clickItem', index);
		},
	},
};
</script>

<style lang="scss" scoped>
.uni-swiper__warp {
	/* #ifndef APP-NVUE */
	display: flex;
	/* #endif */
	flex-direction: column;
	position: relative;
	overflow: hidden;
}

.uni-swiper__dots-box {
	position: absolute;
	bottom: 10px;
	left: 0;
	right: 0;
	/* #ifndef APP-NVUE */
	display: flex;
	/* #endif */
	flex: 1;
	flex-direction: row;
	justify-content: center;
	align-items: center;
}

.uni-swiper__dots-item {
	width: 8px;
	border-radius: 100px;
	margin-left: 6px;
	background-color: rgba(0, 0, 0, 0.4);
	/* #ifndef APP-NVUE */
	cursor: pointer;
	/* #endif */
	/* #ifdef H5 */
	// border-width: 5px 0;
	// border-style: solid;
	// border-color: transparent;
	// background-clip: padding-box;
	/* #endif */
	// transition: width 0.2s linear;  不要取消注释，不然会不能变色
}

.uni-swiper__dots-item:first-child {
	margin: 0;
}

.uni-swiper__dots-default {
	border-radius: 100px;
}

.uni-swiper__dots-long {
	border-radius: 50px;
}

.uni-swiper__dots-bar {
	border-radius: 50px;
}

.uni-swiper__dots-nav {
	bottom: 0px;
	// height: 26px;
	padding: 8px 0;
	/* #ifndef APP-NVUE */
	display: flex;
	/* #endif */
	flex: 1;
	flex-direction: row;
	justify-content: flex-start;
	align-items: center;
	background-color: rgba(0, 0, 0, 0.2);
}

.uni-swiper__dots-nav-item {
	/* overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap; */
	font-size: 14px;
	color: #fff;
	margin: 0 15px;
}

.uni-swiper__dots-indexes {
	/* #ifndef APP-NVUE */
	display: flex;
	/* #endif */
	// flex: 1;
	justify-content: center;
	align-items: center;
}

.uni-swiper__dots-indexes-text {
	color: #fff;
	font-size: 12px;
	line-height: 14px;
}
</style>
